Chapter1_Computer networks and the internet(1).ppt

working: A Top Down Approach Featuring the , 3rd edition. Jim Kurose, Keith RossAddison-Wesley, July 2004.
worksmunications
Lectured by:Haibo Hu
School of Software Engineering, Chongqing University
Email:******@cqu.
Cellular Phone: **********
1
Introduction
Chapter 1: Introduction
Our goal:
get “feel” and terminology
more depth, detail later in course
approach:
use as example
Overview:
what’s the
what’s a protocol?
network work core
, physical media
/ISP structure
performance: loss, delay
protocol layers, service work modeling
2
Introduction
Terms in chapter 1
LAN 局域网
WAN 广域网
Router 路由器
Switch 交换机
Protocol 协议
Packet 数据包/报文/分组
ISP 因特网服务提供商
TCP 传输控制协议
UDP 用户数据报协议
内网
Bandwidth 带宽
infrastructure 基础设施
以太网
Multiplexing 多路复用
Encapsulation 封装
Stack 栈
FDM 频分复用
TDM 时分复用
congestion 拥挤、拥塞
外网
3
Introduction
Chapter 1: roadmap
What is the ?
edge
core
access and physical media
structure and ISPs
Delay & loss in packet-works
Protocol layers, service models
History
4
Introduction
Category works
works
work posed of puters connected together using a munication system for the purpose of sharing data, resources munication.
——M/
计算机网络
一般地说,将分散的多台计算机、终端和外部设备用通信线路互联起来,彼此间实现互相通信,并且计算机的硬件、软件和数据资源大家都可以共同使用,实现资源共享的整个系统就叫做计算机网络。
——/dnsj/wjwx/
Position: What is the ?
5
Introduction
Category works
Classified by scale
LAN
A local work (LAN) is a group puters and associated devices that share munications line or wireless link within a small geographic area.
——working./sDefinition/0,,sid7_gci212495,
WAN
A wide work (WAN) is a geographically dispersed work. The term distinguishes a broader munication structure from a local work (LAN).
——working./sDefinition/0,290660,sid7_gci214117,
a worldwide system works - work works in which users at any puter can, if they have permission, get information from any puter, even use the puters.
——M/I/.html
Position: What is the ?
6
Introduction
C